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// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
// * with the License.  You may obtain a copy of the License at                                                              *
// *                                                                                                                         *
// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
// *                                                                                                                         *
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// ***************************************************************************************************************************
package org.apache.juneau.internal;

/**
 * Represents a simple object pair.
 * 
 * @param <F> The first object type.
 * @param <S> The second object type.
 */
public class Pair<F,S> {
	private final F first;
	private final S second;

	/**
	 * Constructor.
	 * 
	 * @param first The first object in the pair.
	 * @param second The second object in the pair.
	 */
	public Pair(F first, S second) {
		this.first = first;
		this.second = second;
	}

	/**
	 * Returns the first object in the pair.
	 * 
	 * @return The first object in the pair.
	 */
	public F first() {
		return first;
	}

	/**
	 * Returns the second object in the pair.
	 * 
	 * @return The second object in the pair.
	 */
	public S second() {
		return second;
	}

	@Override /* Object */
	public boolean equals(Object o) {
		if (o instanceof Pair) {
			Pair<?,?> p = (Pair<?,?>)o;
			return ObjectUtils.equals(first, p.first) && ObjectUtils.equals(second, p.second);
		}
		return false;
	}

	@Override /* Object */
	public int hashCode() {
		return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
	}
}
